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Indentation fracture behavior of energetic and inert molecular crystals

Published online by Cambridge University Press:  22 November 2019

Alexandra C. Burch Open the ORCID record for Alexandra C. Burch [Opens in a new window] ,
John D. Yeager  and
David F. Bahr
Alexandra C. Burch
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA; and Explosive Science and Shock Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA Explosive Science and Shock Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
John D. Yeager
Affiliation:
Explosive Science and Shock Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
David F. Bahr*
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA; and Explosive Science and Shock Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
*
a)Address all correspondence to this author. e-mail: dfbahr@purdue.edu
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Abstract

Measuring the elastic and plastic properties with nanoindentation is predicated on the indentation not fracturing the material. In this study, an unloading curve analysis is used to identify indentation-induced fracture in brittle molecular organic crystals to define conditions, where properties measurements are accurate, and for calculating the toughness. Single crystals of cyclotetramethylene tetranitramine (HMX) and idoxuridine were indented from 1 to 300 mN with indenter probes of varying acuity to identify fracture initiation loads. Idoxuridine displayed no fracture up to and at 100 mN, with fracture occurrence then seen at an increasing rate until every indentation made induced fracture at 300 mN. HMX displayed no fracture up to and at 4 mN, with fracture then occurring at an increasing rate until every sample fractured at 8 mN. The toughness of HMX and idoxuridine is ≈0.28 ≈ 0.4–0.5 MPa/m1/2, respectively.

Keywords

nanoindentationfracturehardness

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Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 23 , 16 December 2019 , pp. 3954 - 3963
Copyright
Copyright © Materials Research Society 2019 

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